00421nam a22001457a 4500003000400000005001700004008004100021020001500062040000800077082001200085100002200097245011800119260003000237300000800267OSt20250903144630.0231122b        |||||||| |||| 00| 0 eng d  a8176631299  cddc  a631 BIM  aBimal Chandra Mal  aIntroduction to Soil and Water Conservation Engineeringb: surveying, irrigation, drainage and soil conservation   aKalyani Publicationc2002  a429